diff --git a/lib/VGA_ctrl/sim/tb_vga_frontend64.fdo b/lib/VGA_ctrl/sim/tb_vga_frontend64.fdo
index 79f0b4a..69fd246 100644
--- a/lib/VGA_ctrl/sim/tb_vga_frontend64.fdo
+++ b/lib/VGA_ctrl/sim/tb_vga_frontend64.fdo
@@ -8,6 +8,8 @@ vcom -explicit  -93 "../../FIFO/src/fifo_ctrl_pkg.vhd"
 vcom -explicit  -93 "../../FIFO/src/gray_counter.vhd"
 vcom -explicit  -93 "../../FIFO/src/fifo_async_ctrl.vhd"
 vcom -explicit  -93 "../../FIFO/src/fifo_async.vhd"
+vcom -explicit  -93 "../../FIFO/src/fifo_sync_ctrl.vhd"
+vcom -explicit  -93 "../../FIFO/src/fifo_sync.vhd"
 vcom -explicit  -93 "../src/fonts/char_rom_c64.vhd"
 vcom -explicit  -93 "../src/vga_types.vhd"
 vcom -explicit  -93 "../src/char_gen.vhd"